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Grammar Formalisms Course Notes 1 Grammar Formalisms Course Notes 1 Ash Asudeh University of Canterbury [email protected] December 6–7, 2004 1 Theoretical Linguistics • Linguistics := The study of human language • Linguistic theory := 1. A scientific theory of human languages (Bloomfield) 2. A scientific theory of knowledge of language (Chomsky) • Pollard and Sag on mathematical theories: In any mathematical theory about an empirical domain, the phenomena of inter- est are modelled by mathematical structures, certain aspects of which are con- ventionally understood as corresponding to observables of the domain. The the- ory itself does not talk directly about the empirical phenomena; instead, it talks about, or is interpreted by, the modelling structures. Thus the predictive power of the theory arises from the conventional correspondence between the model and the emprirical domain. (Pollard and Sag 1994:6) • Grammar formalism := a mathematically precise notation for formalizing a theory of gram- mar • Chomsky on the need to formalize linguistic theory: Precisely constructed models for linguistic structure can play an important role, both negative and positive, in the process of discovery itself. By pushing a precise but inadequate formuolation to an unacceptable conlusion, we can often expose the exact source of this inadequacy and, consequently, gain a deeper understand- ing of the linguistic data. More positively, a formalized theory may automatically provide solutions for many problems other than those for which it was explicitly designed. Obscure and intuition-bound notions can neither lead to absurd con- clusions nor provide new and correct ones, and hence they fail to be useful in two important respects. I think that some of those linguists who have questioned the value of precise and technical development of linguistic theory have failed to recognize the productive potential in the method of rigorously stating a proposed theory and applying it strictly to linguistic material with no attempt to avaoid un- acceptable conclusions by ad hoc adjustments or loose formulation. (Chomsky 1957:5) 1 Grammar Formalisms (Asudeh) ALTSS 2004, Sydney Notes.1 / 2 • In grammar engineering and other computational applications of linguistics, we have no choice: a formalism is required for the simple reason that we need a language for encoding grammars that is a) understandable by humans and b) understandable by computers: ◦ Grammar development in machine language is not feasible for humans. ◦ Computers can’t understand natural language statements of grammars, no matter how perspicuous to humans. • Grammaticality: (1) a. Colorless green ideas sleep furiously. (Chomsky 1957) b. *Furiously sleep ideas green colorless. (2) a. Revolutionary new idea appear infrequently. (Sells 1985) b. *Infrequently appear ideas new revolutionary. • Syntax := The sub-field in linguistics concerned with how words combine into larger units — phrases — and how phrases in turn combine into yet larger units: ◦ word order (3) a. Her tall brother is handsome. b. *Tall her is handsome brother. (4) a. Aren’t I allowed to attend? b. *I aren’t allowed to attend. ◦ agreement (5) Every girl / *girls is / *are female / *females. (6) All *girl / girls *is / are female / females. ◦ heads and complementation (7) a. Thora fears the vacuum cleaner. b. Thora fears that the vacuum cleaner will get her. c. *Thora fears of the vacuum cleaner. (8) a. *Thora is afraid the vacuum cleaner. b. Thora is afraid that the vacuum cleaner will get her. c. Thora is afraid of the vacuum cleaner. (9) a. The vacuum cleaner frightens Thora. b. *The vacuum cleaner frightens Thora that it will get her. c. *The vacuum cleaner frightens of Thora. Grammar Formalisms (Asudeh) ALTSS 2004, Sydney Notes.1 / 3 ◦ bounded dependencies (10) a. Mary said Ken pinched her. b. *Mary said Ken pinched herself. c. Mary said Ken pinched himself. ◦ (11) a. David said Ken and Mary tried to arrive together. b. *Ken and Mary said David tried to arrive together. ◦ unbounded dependencies (12) What did Kim claim that Sandy suspected that Robin stole? • Semantics := The sub-field in linguistics concerned with meaning. ◦ Truth conditions (13) “Snow is white” is true if and only if snow is white. ◦ Entailment (14) Every student wants good grades ⇒ That student wants good grades ◦ Presupposition (15) Jones has stopped smoking presupposes that Jones smoked 1.1 Modern Perspectives • Generative grammar := A system of rules that defines in a formally precise way (i.e. ‘gen- erates’ [in the mathematical sense – AA]) a set of [structures] that represent the well-formed sentences of a given language. (Sag et al. 2003:525) ◦ This only covers syntax, but generative grammar extends to other sub-systems of lin- guistic information (semantics, phonology, morphology) under the requirement that explicit systems of rules for those sub-systems are stated. • Two conceptions of language (Soames 1984): ◦ Languages are abstract mathematical systems in the world. (mathematical/Platonic conception) ◦ Languages are internalized systems of knowledge in the minds of speakers. (psychological/cognitive conception) • The currently dominant view in linguistics and cognitive science is the second, cogni- tive/”Knowledge of Language” conception (discussed cogently in Chomsky 1986:1–50). ◦ Three basic questions for linguistics (Chomsky 1986:3): 1. What constitutes knowledge of language? 2. How is knowledge of language acquired? 3. How is knowledge of language put to use? ◦ Chomsky’s goals and assumptions (Green and Morgan 2001:2–6): 1. The mind is innately structured. 2. The mind is modular. 3. There is a distinct module for language. 4. Language acquisition is the central puzzle for linguistic theory. 5. Syntax is formal. 6. Knowledge of language is itself modular. Grammar Formalisms (Asudeh) ALTSS 2004, Sydney Notes.1 / 4 1.2 Goalsof the Field • Acquisition and learnability • Typology and universals • Explanatory wide coverage • Human language processing • Computation linguistics ◦ Mathematical linguistics ◦ Parsing ◦ Generation ◦ Statistical NLP 2 Grammatical Architectures 2.1 Categorial Grammar • Form-meaning pairing (PHONETIC FORM–PREDICATE-ARGUMENT STRUCTURE), mediated by syntactic categories, projected from lexicon LEXICON married := (S\NP)/NP: married 0 Combinatory Projection Anna married Manny := S: (λx.married 0x anna0) manny0 Phonology Normalization PHONETIC FORM PREDICATE-ARGUMENT STRUCTURE “Anna married Manny” married 0manny0anna0 2.2 Head-Driven Phrase Structure Grammar • Sign-based architecture (term sign used in the sense of Saussure 1919/1959) (16) PHONOLOGY h . i CATEGORY category SYNSEM CONTENT content CONTEXT context sign • Directed acyclic graphs represent sorted feature structures, the objects in the theory that model linguistic phenomena (signs) • Attribute-value matrices describe feature structures Grammar Formalisms (Asudeh) ALTSS 2004, Sydney Notes.1 / 5 2.3 Lexical Functional Grammar • Parallel projection architecture (Kaplan 1987, Halvorsen and Kaplan 1988, Kaplan 1989) ◦ Separate levels of representation (projections) model different aspects of linguistic information · Constituent structure (c-structure): precedence, dominance, constituency · Functional structure (f-structure): grammatical functions, predication, subcatego- rization, bounded and unbounded dependencies ◦ Each projection modelled by logics and data structures appropriate for capturing the information it models · C-structure: trees, described by phrase structure rules · F-structure: tabular functions (represented as attribute value matrices), described by regular expressions ◦ Projection functions map from projection to successive projection information structure • phonological structure • ι morphological structure ρ • µ Form φ Meaning ••π α •λ •••σ ψ string c-structure argument structure f-structure s-structure model References Chomsky, Noam. 1957. Syntactic Structures. The Hague: Mouton. —. 1986. Knowledge of Language: Its nature, origin, and use. New York: Praeger. Dalrymple, Mary, Ronald M. Kaplan, John T. Maxwell, and Annie Zaenen, eds. 1995. Formal issues in Lexical-Functional Grammar. Stanford, CA: CSLI Publications. Green, Geogia M., and Jerry L. Morgan. 2001. A Practical Guide to Syntactic Analysis. Stanford, CA: CSLI Publications, 2nd edn. Halvorsen, Per-Kristian, and Ronald M. Kaplan. 1988. Projections and Semantic Description in Lexical-Functional Grammar. In Proceedings of the International Conference on Fifth Genera- tion Computer Systems, 1116–1122. Institute for New Generation Systems, Tokyo. Kaplan, Ronald M. 1987. Three Seductions of Computational Psycholinguistics. In P. Whitelock, M. M. Wood, H. L. Somers, R. Johnson, and P. Bennett, eds., Linguistic Theory and Computer Applications, 149–181. London: Academic Press. Reprinted in Dalrymple et al. (1995:339– 367). —. 1989. The Formal Architecture of Lexical-Functional Grammar. In Chu-Ren Huang and Keh- Jiann Chen, eds., Proceedings of ROCLING II, 3–18. Reprinted in Dalrymple et al. (1995:7–27). Grammar Formalisms (Asudeh) ALTSS 2004, Sydney Notes.1 / 6 Pollard, Carl, and Ivan A. Sag. 1994. Head-driven Phrase Structure Grammar. Chicago, IL and Stanford, CA: The University of Chicago Press and CSLI Publications. Sag, Ivan A., Thomas Wasow, and Emily M. Bender. 2003. Syntactic Theory: A Formal Introduc- tion. Stanford, CA: CSLI Publications, 2nd edn. Saussure, Ferdinand de. 1919/1959. Course in General Linguistics. New York: McGraw-Hill. Sells, Peter. 1985. Lectures on Contemporary Syntactic Theory. Stanford,
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